config: barpyrus: config.py: add keyboard layout switcher

There are now several keyboard layouts to switch to with the click of a
button. In order to not make the panel too crowded the available layouts
are hidden behind a ShortLongLayout which allows to make them visible
only when necessary.

config/barpyrus/config.py

@@ -49,6 +49,14 @@ def frame(content, bg, fg, padding = (3, 3)):
 # conky specific configuration
 conky_text = ''
 
+# options for hlwm.HLWMLayoutSwitcher widget
+xkblayouts = [
+        'us us -variant altgr-intl us'.split(' '),
+        'de de de'.split(' '),
+]
+setxkbmap = 'setxkbmap -option compose:menu -option ctrl:nocaps'
+setxkbmap += ' -option compose:ralt -option compose:rctrl'
+
 # get space for the panel
 hc(['pad', str(monitor), str(height)])
 
@@ -70,5 +78,12 @@ bar.widget = W.ListLayout([
 
     W.RawLabel('%{r}'),
     conky.ConkyWidget(text = conky_text),
+    W.ShortLongLayout(
+        W.RawLabel(''),
+        W.ListLayout([
+            hlwm.HLWMLayoutSwitcher(hc, xkblayouts, command = setxkbmap.split(' ')),
+            W.RawLabel(' '),
+        ])
+    ),
     frame(W.DateTime('%d. %B, %H:%M'), 'grey', 'white'),
 ])